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1116学习记录 简单练车模型

2016-11-16 10:53 316 查看
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
#div1 {width:30px; height:20px; background:red; position:absolute; top:150px; left:50px;}
#div2 {width:2px; height: 500px; background-color: blue;position: absolute;left: 100px;}
#div3 {width:2px; height: 500px; background-color: blue;position: absolute;left: 300px;}
</style>
<script>
var timer=null;

function startDown()
{
var oDiv=document.getElementById('div1');
var speed = 1;
clearInterval(timer);
timer=setInterval(function (){

if(oDiv.offsetTop>=300)
{
clearInterval(timer);
}
else
{
oDiv.style.top=oDiv.offsetTop+speed+'px';
}
}, 30);
}

function startUp()
{
var oDiv=document.getElementById('div1');

clearInterval(timer);
timer=setInterval(function (){
var speed=-1;

if(oDiv.offsetTop<=50)
{
clearInterval(timer);
}
else
{
oDiv.style.top=oDiv.offsetTop+speed+'px';
}
}, 30);
}

function startLeft()
{
var oDiv=document.getElementById('div1');

clearInterval(timer);
timer=setInterval(function (){
var speed=5;

if(oDiv.offsetLeft>=300)
{
clearInterval(timer);
}
else
{
oDiv.style.left=oDiv.offsetLeft+speed+'px';
}
}, 30);
}

function startRight()
{
var oDiv=document.getElementById('div1');

clearInterval(timer);
timer=setInterval(function (){
var speed=-5;

if(oDiv.offsetLeft<=100)
{
clearInterval(timer);
}
else
{
oDiv.style.left=oDiv.offsetLeft+speed+'px';
}
}, 30);
}
</script>
</head>

<body>
<input id="btn1" type="button" value="开始往下" onclick="startDown()" />
<input id="btn2" type="button" value="开始往上" onclick="startUp()" />
<input id="btn3" type="button" value="开始往右" onclick="startLeft()" />
<input id="btn4" type="button" value="开始往左" onclick="startRight()" />
<div id="div1">
</div>
<div id="div2">
</div>
<div id="div3">
</div>
</body>
</html>
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